why this code is not working?

Question

ramya 2018-4-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/395433-why-this-code-is-not-working

回答： Image Analyst 2018-4-19

i have code which is perfectly working fine with cameraman.tif but with other images its not ..what is wrong in the code?

   [X,Y,Z] = peaks(200); 
  I = double(imread('cameraman.tif')); 
  figure;
  mesh(X, Y, Z, I); 
  colormap jet;
above one is working fine

but this one not .i have to generate surf and mesh images kindly suggest what is wrong

clc
close all
clear all
% a=VideoReader('C:\Users\tce21\Downloads\test.mp4');                                   % Read a video
% b = read(a,1);                                               % Read 1st frame
% c=rgb2gray(b);
% [X,Y,Z] = peaks(200); % surface
I = double(c); 
figure;
mesh(X, Y, Z, I); % overlay image as texture
colormap jet;
image s attached
i want same output as cameraman but with mesh grid lines with the figure attached
as 1st images.

help is really appreciated

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Image Analyst 2018-4-19

在 MATLAB Online 中打开

This:

[X,Y,Z] = peaks(200);
I = double(imread('cameraman.tif'));
figure;
mesh(X, Y, Z, I);
colormap jet;

does not work fine. It generates error

Warning: Error creating or updating Surface
 Error in value of property  CData
 Array is wrong shape or size

At that point, I quit working on this question.

KSSV 2018-4-19

Yes....true Image Analyst. There were two or three questions on how to mesh a image by the user which were not closed by the user so far.

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Answer 1

Image Analyst 2018-4-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/395433-why-this-code-is-not-working#answer_315965

在 MATLAB Online 中打开

Try this:

rgbImage = imread('1st images.bmp');
subplot(1, 2, 1);
imshow(rgbImage);
% Get the dimensions of the image.  
% numberOfColorChannels should be = 1 for a gray scale image, and 3 for an RGB color image.
[rows, columns, numberOfColorChannels] = size(rgbImage);
if numberOfColorChannels > 1
	% It's not really gray scale like we expected - it's color.
	% Use weighted sum of ALL channels to create a gray scale image.
	rgbImage = rgb2gray(rgbImage); 
	% ALTERNATE METHOD: Convert it to gray scale by taking only the green channel,
	% which in a typical snapshot will be the least noisy channel.
	% grayImage = grayImage(:, :, 2); % Take green channel.
end
% Make white surround black.
rgbImage(rgbImage == 255) = 0;
[X, Y] = meshgrid(1:columns, 1:rows);
dblImage = double(rgbImage); 
Z = dblImage;
subplot(1, 2, 2);
mesh(X, Y, Z, dblImage); % overlay image as texture
colormap jet;
fontSize = 20;
xlabel('X, column', 'FontSize', fontSize);
ylabel('Y, Row', 'FontSize', fontSize);
zlabel('Intensity', 'FontSize', fontSize);